Cracked a nut, go for something sweet (6)
I believe the answer is:
nougat
'something sweet' is the definition.
'cracked a nut go' is the wordplay.
'cracked' is an anagram indicator.
'a'+'nut'+'go'='anutgo'
'anutgo' with letters rearranged gives 'NOUGAT'.
'for' acts as a link.
(Other definitions for nougat that I've seen before include "Honeyed sweet" , "Chewy nutty sweet" , "Chewy almond sweet" , "Chewy sweet with sugar, honey, nuts etc." , "Chewy pink or white sweet" .)